main() {
    *(char *)0x2000 = 'a';
    *(int *)0x2000 = 0xf;
    *(char far *)0x20001000 = 'a';

    _AX = 0x2000;
    *(char *)_AX = 'b';

    _BX = 0x1000;
    *(char *)(_BX + _BX) = 'a';
    *(char far *)(0x20001000 + _BX) = *(char *)_AX
}
